It will be available for Playstation 3 and Xbox 360.
Characters confirmed are Wolverine, Hulk, Spiderman, Magneto and Ironman are representing the MARVEL side so far. Morrigan, Ryu (of course), and Chris Redfield (Resident Evil 5 version) are on the CAPCOM side. HOW AWESOME IS THAT!?
It seems to have an interesting look from the trailer, very Tatsunoko VS Capcom feel with a dark ink like edge to it. It was said that it would be 2D with 3D elements. I guess that's to make it look like comic book art in a way.
According to the MVC3 news going around it will be released "later this year or early 2011" and will be flying at "full 1080p"! They are already bragging about the number of characters in this game being super duper ridiculous. So I'm guessing we expect a huge chunk (if not all) of the old MVC2 cast plus at least a dozen more. Here's to hoping they add Thor and Deadpool!!